CN2684471Y - Optical transmitter and receiver with embedded error code testing function - Google Patents
Optical transmitter and receiver with embedded error code testing function Download PDFInfo
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- CN2684471Y CN2684471Y CNU2004200072251U CN200420007225U CN2684471Y CN 2684471 Y CN2684471 Y CN 2684471Y CN U2004200072251 U CNU2004200072251 U CN U2004200072251U CN 200420007225 U CN200420007225 U CN 200420007225U CN 2684471 Y CN2684471 Y CN 2684471Y
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Abstract
The utility model relates to an optical transmitter and receiver with embedded code error test function, which comprises a microprocessing unit, an E1 line interface unit, an optical link interface unit, a code error test unit and a branch line test selector unit which is respectively connected with the E1 line interface unit, the optical link interface unit and the code error test unit. The code error test unit produces test sequences and tests transmitted test sequences. When a code error test is carried out, a testing method can be selected freely from such three methods as internal loopback of a far-end optical transmitter and receiver, external loopback of the far-end optical transmitter and receiver and para-test of double end optical transmitters and receivers to perform corresponding procedures which are under the control of a network managing platform. The control commands are sent by the microprocessing unit of the optical transmitter and receiver and are performed by the branch line test selector unit practically, which realizes that the test sequences can be sent towards any branch lines towards the optical direction or the E1 line direction and the test sequences of any branch lines of the optical direction or the E1 line direction can be sent and tested by the code error test unit.
Description
Technical field
The utility model relates to optical communication technique, relate to a kind of optical transceiver equipment or rather, the optical transceiver equipment of error code testing function that has been embedded, by the error monitoring function is provided for optical transceiver, join the error code testing that code error tester just can carry out transmission line outside the user need not, help reducing user's the maintenance cost and the input cost of equipment.
Background technology
One of problem that presses for solution in the telecommunications service is to realize intelligentized end-to-end test in the transmission system at present, so that for the user provides differentiation, personalized service, realizes high quality and favourable price, really satisfies the requirement of service-level agreement (SLA).
Existing solution optical transceiver end-to-end test problem utilizes code error tester to solve usually, promptly finishes by adding code error tester.Concrete grammar has following several:
1. pass through the internal loopback of far-end optical transceiver.As shown in fig. 1.
The a certain road e1 port of code error tester and local terminal optical transceiver A is coupled together with cable, the corresponding e1 port signal of far-end optical transceiver B is encircled certainly in inside, code error tester sends cycle tests, be looped back to local terminal optical transceiver A and code error tester again through local terminal optical transceiver A, far-end optical transceiver B, thereby finish the detection of cycle tests, the statistics and the alarm of error code.
2. pass through the external loop of far-end optical transceiver.As shown in Figure 2.
The a certain road e1 port of code error tester and local terminal optical transceiver A is coupled together with cable, the corresponding e1 port signal of far-end optical transceiver B is externally encircled certainly, code error tester sends cycle tests, be looped back to local terminal optical transceiver A and code error tester again through local terminal optical transceiver A, far-end optical transceiver B, thereby finish the detection of cycle tests, the statistics and the alarm of error code.
3. pass through two code error tester A1, B1 to surveying.As shown in Figure 3.
The a certain road e1 port of code error tester A1 and optical transceiver A is coupled together with cable, the corresponding e1 port of code error tester B1 and optical transceiver B is coupled together with cable, can send cycle tests through optical transceiver A, optical transceiver B to the code error tester B1 of far-end by code error tester A1, finish the detection of cycle tests, the statistics and the alarm of error code by code error tester B1; Perhaps, send cycle tests through optical transceiver B, optical transceiver A to the code error tester A1 of far-end, finish the detection of cycle tests, the statistics and the alarm of error code by code error tester A1 by code error tester B1.
The major defect of above-mentioned test mode is: the user also needs to buy error code testing equipment separately except needs are bought optical transceiver, thereby the cost of investment height of equipment; When system went wrong, the operation maintenance personnel must arrive on-the-spot, just can test and fault location, thereby the fault location response time are slow; In the environment of the complicated network structure, be unfavorable for user's whole maintenance management, thereby the operation expense height of network.
The utility model content
The purpose of this utility model is a kind of embedded optical transceiver of error code testing function of design, this optical transceiver the has been embedded optical transceiver of error code testing function, integrate existing three kinds of method of testings, can solve the major defect of existing test mode, reduce the operation expense of cost of investment, quickening fault location response time and reduction network.
The technical scheme that realizes the utility model purpose is such: a kind of optical transceiver of embedded code error test function, comprise the optical transceiver part of forming by microprocessor unit, E1 line interface unit and optical line interface unit, the E1 line interface unit is connected with subscriber equipment by E1 service signal I/O end, the optical line interface unit is connected with optical fiber by light signal I/O end, the optical line interface unit comprises multiplexer and demodulation multiplexer, it is characterized in that:
Also comprise error code testing unit and branch road test selector unit; The error code testing unit comprises pseudo-random sequence generator and pseudo random sequence detector;
Microprocessor unit is connected E1 line interface unit, error code testing unit, branch road test selector unit and optical line interface unit by data/address bus with control bus, branch road test selector unit connects error code testing unit, E1 line interface unit and optical line interface unit respectively;
The detection sequence that pseudo-random sequence generator produces sends described branch road tester selected cell to, and branch road tester selected cell will send the pseudo random sequence detector cell to from the detection sequence of circuit to be measured; Described branch road test selector unit is under the control of microprocessor unit, finish the branch road of detection sequence between E1 line interface unit and optical line interface unit of E1 service signal or transmission and select and the direction selection, and branch road selection and the direction selection of detection sequence between E1 line interface unit and optical line interface unit from circuit to be measured of finishing E1 service signal or reception; Described E1 line interface unit is finished and is detected loopback and the encoding and decoding of E1 service signal, the Clock Extraction of E1 service signal and the selection of E1 service signal HDB3 sign indicating number and NRZ sign indicating number of sequence on circuit to be measured under the control of microprocessor unit.
The optical transceiver that utilizes the error code testing function embedded is when realizing the error code testing of end-to-end transmission, can be from far-end optical transceiver internal loopback, far-end optical transceiver external loop and two ends optical transceiver to selecting any test mode three kinds of test modes surveying, and according to the corresponding execution in step B1 of the test mode of selecting or B2 or B3;
B1. when selecting the test mode of far-end optical transceiver internal loopback, Network Management Equipment is controlled circuit near-end optical transceiver to be measured, to detect sequence by branch road test selector unit selects and recommends and sends on the optical line interface unit and the detection sequence that the optical line interface unit receives is selected and recommended the error code testing unit detect; Network Management Equipment control far-end optical transceiver, by branch road test selector unit the choosing of E1 line interface unit is received on the optical line interface unit, the detection sequence that the optical line interface unit is received is selected and recommended on the E1 line interface unit and will be sent the E1 data circuit by described E1 line interface unit and is looped back to branch road test selector unit;
B2. when selecting the test mode of far-end optical transceiver external loop, Network Management Equipment is controlled circuit near-end optical transceiver to be measured, to detect sequence by branch road test selector unit selects and recommends and sends on the optical line interface unit and the detection sequence that the optical line interface unit receives is selected and recommended the error code testing unit detect; Network Management Equipment control far-end optical transceiver, by branch road test selector unit the choosing of E1 line interface unit is received on the optical line interface unit, the detection sequence that the optical line interface unit receives is selected and recommended on the E1 line interface unit, and the transmission in far-end optical transceiver outside with described E1 line interface unit is connected with reception E1 data circuit;
B3. when selecting the two ends optical transceiver to the test mode surveyed, the branch road test selector unit of Network Management Equipment control local terminal and far-end optical transceiver will detect sequence and select and recommend that the optical line interface unit sends and the detection sequence of optical line interface unit reception is selected and recommended the detection sequential detector detect.
Key point of the present utility model is that the parts that will realize the Error Detector function are embedded in the optical transceiver, and in conjunction with the loop fuction of optical transceiver and network management system webmaster ability to optical transceiver, neatly for the user provides circuit real-time testing scheme easily, comprise any test mode that realizes in the existing test mode by design branch road test selector.The utility model is embedded in the structural design of optical transceiver by the functional part of Error Detector being tested error code, and is in real time gathering error code and by branch road tester selected cell different directions (light mouth direction or E1 line direction), different way E1 is being carried out error code testing respectively at any time.
The utility model can be realized existing end-to-end error code testing scheme at present by means of webmaster control; Equipment cost and operation expense are lower than existing testing scheme; Fault location is rapider than existing testing scheme, can realize intelligentized test.When maybe needing to carry out the whole network detection when breaking down, the O﹠M personnel only need carry out shirtsleeve operation (sending control command) on the webmaster platform, and optical transceiver equipment will carry out line test automatically, and the test result of gathering is reported to the webmaster platform.
Description of drawings
Fig. 1 is the method schematic diagram that existing mode by the remote termination internal loopback is carried out end-to-end error code testing;
Fig. 2 is the method schematic diagram that existing mode by the remote termination external loop is carried out end-to-end error code testing;
Fig. 3 is the existing method schematic diagram that carries out end-to-end error code testing by two code error testers;
Fig. 4 is the optical transceiver principle structure block diagram of embedded code error test function parts;
Fig. 5 is the principle structure block diagram of the E1 line interface unit among Fig. 4;
Fig. 6 is the principle structure block diagram of the branch road tester selected cell among Fig. 4;
Fig. 7 is the circuit structure schematic diagram of the pseudo-random sequence generator among Fig. 4;
Fig. 8 is the circuit structure schematic diagram of the pseudo random sequence detector among Fig. 4;
Fig. 9 utilizes technology of the present utility model to realize the circuit schematic diagram of location fast.
Embodiment
The future development master trend of optical communication field is device miniaturization, high-quality, thereby each operator also will inevitably take corresponding technical measures to realize above-mentioned requirements, and wherein embedded total solution becomes an important technology in the intelligentized design.
Utilize the utility model equipment to realize that the test of end-to-end transmission error code is to adopt optical transceiver embedded code error tester function and the loopback by webmaster control far-end optical transceiver or directly detect.
Referring to Fig. 4, be the embedded optical transceiver structure of error code testing function.Form by five functional parts: microprocessor unit 41, optical line interface unit 42, E1 line interface unit 43, error code testing unit 44 and branch road tester selected cell 45.Wherein microprocessor unit 41, optical line interface unit 42 and E1 line interface unit 43 be the existing existing functional part of optical transceiver (but to E1 line interface unit 43 slightly some changes), error code testing unit 44 and branch road tester selected cell 45 are to be embedded in functional part in the optical transceiver for the Error detection function that realizes optical transceiver.Microprocessor unit 41 passes through data, control bus and optical line interface unit 42, E1 line interface unit 43, and error code testing unit 44 is connected with branch road tester selected cell 45, realizes control and transfer of data to each unit.
Microprocessor unit (CPU) 41 is except that finishing the work of the overall optical terminal control, also according to the requirement of webmaster control desk, is responsible for to the configuration of error code testing and to the collection and the analysis of test result test result being reported to the webmaster control desk.
Optical line interface unit 42 is connected with the optical fiber side, mainly comprise multiplexer 421 and demodulation multiplexer 422, finish the justification and the multiplexing or demultiplexing of E1 service signal, the signal of telecommunication is become light signal so that transmitting on the optical fiber and will change the signal of telecommunication into from the light signal on the optical fiber so that it is handled.
E1 line interface unit 43 is finished the coding or the decoding of each branch road E1 service signal High Density Bipolar 3 (HDB3), the Clock Extraction of E1 service signal, the loopback control of the selection of HDB3 sign indicating number and non-return-to-zero (NRZ) sign indicating number and optical transceiver cycle tests.E1 line interface unit 43 can receive the input of the accurate E1 service signal synchronously of NRZ sign indicating number or HDB3 sign indicating number.Under NRZ sign indicating number input pattern, data the rising edge of clock or trailing edge change all can, and software setting can be with the incoming timing paraphase.Also provide external clock to lose the alarm indication simultaneously.For HDB3 sign indicating number input pattern, adopt digital timing extraction in the sheet, and detection signal is lost.To deliver to branch road tester selected cell 45 from the E1 service signal of user's terminal, or will send user terminal from the E1 service signal of branch road test selector unit 45.This E1 line interface unit 43 can also be realized the equipment loopback or the line loopback of e1 port under equipment loopback or line loopback signal controlling from microprocessor unit 41.This E1 line interface unit 43 is selected in the input code type from microprocessor unit 41, the output code type is selected to realize input code type and output code type selection (HDB3 sign indicating number and NRZ sign indicating number) under the signal controlling
Error code testing unit 44, mainly comprising pseudo-random sequence generator 441 and pseudo random sequence detector 442, also is the main function components of common code error tester, finishes the generation of pseudo random sequence, supply to send the detection sequence, and the detection sequence that transmits from the far-end optical transceiver is carried out Error detection.
Branch road test selector unit 45, finish branch road selection and direction selection (light mouth direction still is the E1 line direction) that each E1 branch road sends cycle tests, and the branch road of E1 acceptance test sequence selects (each E1 branch road) and direction to select (light mouth direction still is the E1 line direction).
Branch road test selector unit 45 sends any branch road of cycle tests to light mouth direction or E1 line direction under the control of CPU 41; With the cycle tests of light mouth direction or any branch road of E1 line direction is delivered to the Error detection unit.
When carrying out the transmission of E1 service signal, the local terminal optical transceiver is under microprocessor unit 41 controls, the E1 service signal of subscriber equipment is sent into the multiplexer 421 of optical line interface unit 42 through E1 line interface unit 43, branch road tester selected cell 45, send Optical Fiber Transmission after finally changing light signal into; From the E1 service signal of far-end optical transceiver, by optical line interface unit 42 demultiplexings of local terminal optical transceiver, the final signal of telecommunication that forms send user terminal through branch road tester selected cell 45, E1 line interface unit 43 again.
When carrying out Error detection, if select the mode of far-end optical transceiver loopback (internal loopback) to detect, the local terminal optical transceiver is under microprocessor unit 41 controls, the detection sequence that pseudo-random sequence generator 441 produces is sent into optical line interface unit 42 through branch road test selector unit 45 multiplexer 421 send Optical Fiber Transmission after changing light signal into; Far-end optical transceiver Be Controlled is set to the line loopback connection status, detect sequence and go into optical fiber through far-end optical transceiver loopback, optical line interface unit 42 by the local terminal optical transceiver demultiplexes into the signal of telecommunication, carries out Error detection, statistics again and alarm etc. in the pseudo random sequence detector 412 of error code testing unit 44 is delivered in branch road test selector unit 45.
If select the mode of far-end optical transceiver loopback (external loop) to detect, the local terminal optical transceiver is under microprocessor unit 41 controls, the detection sequence that pseudo-random sequence generator 441 produces is sent into optical line interface unit 42 through branch road test selector unit 45, and send error code testing unit 44 with the detection sequence that optical line interface unit 42 receives through branch road test selector unit 45; The far-end optical transceiver is under microprocessor unit 41 controls, the E1 line interface is chosen optical line interface unit 42 through branch road test selector unit 45, and the detection sequence that optical line interface unit 42 receives chosen the E1 line interface through branch road test selector unit 45, the E1 line interface unit is not made line loopback, by the device external loopback.
If select the two ends optical transceiver that the mode of surveying is detected, the local terminal optical transceiver is under microprocessor unit 41 controls, the detection sequence that pseudo-random sequence generator 441 produces is sent into optical line interface unit 42 through branch road test selector unit 45 multiplexer 421 send Optical Fiber Transmission after changing light signal into; Far-end optical transceiver Be Controlled is set to the connection status between optical line interface and error code testing unit, detect sequence and demultiplex into the signal of telecommunication, in branch road tester selected cell 45 is delivered to the pseudo random sequence detector 412 of error code testing unit 44, carry out Error detection, statistics again and alarm etc. through the optical line interface unit 42 of far-end optical transceiver.
Referring to Fig. 5, theory diagram for E1 line interface unit 43, finish the coding or the decoding of E1 service signal High Density Bipolar 3 (HDB3), the Clock Extraction of E1 service signal, the loopback control of the selection (more than be the optical transceiver original function) of HDB3 sign indicating number and non-return-to-zero (NRZ) sign indicating number and optical transceiver close beta sequence comprises line loopback and equipment loopback.Comprise that mainly 2 select 1 switch 431,432,433,434, HDB3 encoder 435, the clock extracting circuit 437 of HDB3 decoder 436 and E1 service signal.The input code type selects signal controlling 2 to select 1 switch 433 to select input HDB3 sign indicating numbers or NRZ sign indicating number (from user equipment side); The output code type selects signal controlling 2 to select 1 switch 432 to select output HDB3 sign indicating numbers or NRZ sign indicating number (to user equipment side); The equipment loopback selects signal controlling 2 to select 1 switch 434 to select the device interior loopbacks (to receive the E1 data through 431, go into 433 or directly into 433,434 through 437,436 again, go into 432 or through 435 again directly into 432, send to subscriber equipment, this equipment loop fuction is used for the detection between subscriber equipment and optical transceiver), otherwise select signal from branch road test selector unit 45, line loopback selects signal controlling 2 to select 1 switch 431 to select line loopbacks output (output is from 2 output signals of selecting 1 switch 432), otherwise the E1 data of selective reception subscriber equipment.When carrying out end-to-end Error detection, the far-end optical transceiver is usually operated at the line loopback mode.The equipment loopback is selected to select to select a use with line loopback.It is by the webmaster platform corresponding signal to be inserted the microprocessor unit of notifying optical transceiver in the overhead signal that this loopback is selected control signal, and specifically control by microprocessor unit.
The local terminal optical transceiver is when carrying out the transmitting-receiving of E1 service signal, and the equipment loopback is selected to select all invalid (the A line, the B line that are equivalent among the figure all disconnect) with line loopback.The E1 data of the subscriber equipment that receives, through 2 select 1 switch 431, directly or after E1 Clock Extraction, HDB3 decoding, select 1 switch 433 to do to send branch road test selector unit 45 after the sign indicating number types are selected through 2 again, and send optical line interface 42 to send through branch road test selector unit 45; The E1 service signal from optical line interface that receives selects 1 switch 434, directly or behind the HDB3 coding through branch road test selector unit 45,2, select 1 switch 432 to send the E1 business datum to subscriber equipment through 2 again.
When carrying out Error detection, as if selecting far-end optical transceiver loopback and being the test mode of internal loopback, far-end optical transceiver line loopback is selected effectively (to be equivalent to the A line closure among the figure, the B line disconnects), the detection sequence signal that receives from optical line interface 43, through branch road test selector unit 45,2 select 1 switch 434, directly or behind the HDB3 coding, select 1 switch 432 through 2 again, the A line, 2 select 1 switch 431, directly or through the E1 Clock Extraction, after the HDB3 decoding, select 1 switch 433 to send branch road test selector unit 45 through 2 again, and send optical line interface to send through branch road test selector unit 45.
From above analysis as can be known, compare, increased equipment loop fuction and line loopback function with the structure of the E1 line interface unit of traditional optical transceiver.
Referring to Fig. 6, theory diagram for branch road test selector unit 45, finish mainly that branch road that each E1 branch road sends cycle tests is selected and the direction selection (light mouth direction is to the E1 line direction, still opposite), and the branch road of E1 acceptance test sequence is selected and direction is selected (light mouth direction is to the E1 line direction, still on the contrary).In other words, branch road test selector unit 45 is under the control of microprocessor unit 41, send detecting any branch road of sequence, perhaps the detection sequence of light mouth direction or any branch road of E1 line direction is delivered to error code testing unit 43 to light mouth direction or E1 line direction.Certainly when optical transceiver carries out the transmission of normal E1 service signal, the E1 service signal that branch road test selector unit 45 need be finished between light mouth direction and E1 line direction leads directly to.
Branch road test selector unit 45 mainly comprises three 2 and selects 1 switch 451,452,453.
Carry out E1 service signal when transmission at optical transceiver, in the branch road test selector unit of transmitting terminal optical transceiver, select 1 switch 452 to be delivered to optical line interface unit 42 through 2 from the E1 service signal of E1 line interface unit 43; In the branch road test selector unit of receiving terminal optical transceiver, select 1 switch 453 to be delivered to E1 line interface unit 43 through 2 from the E1 service signal of optical line interface unit.
When optical transceiver carries out Error detection, be divided into selection and detect sequence and select to two kinds of situations of E1 circuit transmission detection sequence to the optical link transmission.
The transmitting terminal optical transceiver is selecting to select 1 switch 453 to deliver to E1 line interface unit 43 from the detection sequence of error code testing unit 44 by C line and 2 among the figure when the E1 circuit sends the detection sequence; The transmitting terminal optical transceiver is selecting to select 1 switch 452 to deliver to optical line interface unit 42 from the detection sequence of error code testing unit 44 by 2 when optical link sends the detection sequence.
The receiving terminal optical transceiver is selecting to select 1 switch 451 to be delivered to error code testing unit 44 from the detection sequence of optical line interface through 2 when optical link sends the detection sequence.Detection sequence from the E1 line interface unit selects 1 switch 451 to deliver to error code testing unit 44 by 2.
Control signal-" selecting the Error detection source ", control 2 selects 1 switch 451 to deliver to the error code testing unit from the detection sequence/E1 service signal of optical line interface unit or from the detection sequence of E1 line interface unit; Control signal-" selecting to send the detection sequence " to the E1 branch road, control 2 selects 1 switch 453 to deliver to the E1 line interface unit from the detection sequence/E1 service signal of optical line interface unit or from the detection sequence of error code testing unit; Control signal-" select send detect sequence to optical link ", control 2 select 1 switch 452 to send to the optical line interface unit from the detection sequence/E1 service signal of E1 line interface unit or from the detection sequence of error code testing unit.
If when selecting far-end optical transceiver loopback and being the test mode of internal loopback, the branch road test selector unit 45 of local terminal optical transceiver will detect sequence and choose optical line interface unit 43 (finishing by 452) and the detection sequence by far-end optical transceiver loopback that optical line interface unit 43 receives is chosen error code testing unit 44 (finishing by 451).Optical line interface unit (finishing by 452) is chosen with the E1 line interface unit in the branch road test selector unit 45 of far-end optical transceiver, choose E1 line interface unit (finishing) with the detection sequence that optical line interface is received by 453, select the line loopback of 1 switch (shown among Fig. 5 431, selecting 1 tunnel) by the 1 in " line loopback selection " signal controlling E1 line interface unit 43 simultaneously with the E1 interface.
If when selecting far-end optical transceiver loopback and being the test mode of external loop, the branch road test selector unit 45 of local terminal optical transceiver will detect sequence and select and recommend optical line interface unit 42 and send (finishing by 452) and the detection sequence by far-end optical transceiver loopback that optical line interface unit 42 receives is selected and recommended error code testing unit 44 (finishing by 451) detect.The branch road test selector unit 45 of far-end optical transceiver is chosen the E1 line interface unit on the optical line interface unit and (is finished by 452), choose on the E1 line interface unit 43 with the detection sequence that optical line interface unit 42 is received and (to finish) by 453, realize the E1 line interface on the line not loopback (shown among Fig. 5 431, select 0 the tunnel), and in the function of device external loopback (receiving the E1 data terminal in as Fig. 5 is connected with transmission E1 data terminal).
If select the two ends optical transceiver that the mode of surveying is detected, the branch road test selector unit 45 of local terminal optical transceiver is selected and recommended 43 transmissions (finishing by 452) of optical line interface unit with the detection sequence of error code testing unit 44 outputs and the pseudo random sequence that optical line interface unit 45 receives is selected and recommended error code testing unit 44 detect (finishing by 451).The branch road test selector unit 45 of far-end optical transceiver is selected and recommended 43 transmissions (finishing by 452) of optical line interface unit with the detection sequence of error code testing unit 44 outputs and the pseudo random sequence that optical line interface unit 45 receives is selected and recommended error code testing unit 44 detect (finishing by 451).
Referring to Fig. 7, be the circuit structure of pseudo-random sequence generator 441 in the error code testing unit 44, this circuit can adopt the pseudo random sequence of 215-1 according to the O.151 middle E1 cycle tests of recommending of ITUT.Connecting into shift register by 15 d type flip flops and an XOR gate constitutes.
Referring to Fig. 8, be the circuit structure block diagram of pseudo random sequence detector 412 in the error code testing unit 44.Comprise pseudorandom synchronous detection unit 4121, pseudo-random sequence generator 4122, comparator 4123 and Bit Error Code Statistics unit 4124.
The pseudo random sequence of 4121 pairs of receptions of pseudorandom synchronous detection unit detects, when going up this receiving sequence synchronously, extracting synchronizing signal gives local pseudo-random sequence generator 4122 and starts local pseudo-random sequence generator 4122, the pseudo random sequence step-by-step of 4123 pairs of detected pseudo random sequences of comparator and generation compares, when a bit-errors takes place when, send a pulse to Bit Error Code Statistics unit 4124, make the Bit Error Code Statistics unit add 1, thereby finish the statistics of Error detection, send microprocessor unit to calculate current number of bit errors again.
Local pseudo-random sequence generator 4122 is independent of pseudo-random sequence generator shown in Figure 4 441, but both employings is identical pseudo random sequence mechanism.
Fig. 7, circuit theory shown in Figure 8 have identical principle with related circuit in traditional code error tester.
The utility model is when implementing, the optical transceiver part that to form by microprocessor unit, E1 line interface unit and optical line interface unit, be arranged in the same integral device with the error code testing unit, the branch road test selector unit that increase, and constitute the embedded optical transceiver of error code testing function of the present utility model.And further with error code testing unit and branch road test selector cell design in same integrated circuit (IC) chip.
Referring to Fig. 9, illustrate among the figure and utilize the utility model equipment to carry out the effect of fault fast positioning.
Set up by subscriber's line M, transmission line E, F, G and subscriber's line N between user A and user B and get in touch (transmission line is divided into E, F, three sections of G are divided into M with subscriber's line, two sections of N).As user A, when the transmission between B was broken down, the optical transceiver 1,2,3,4 by the embedded code error test function can carry out segmentation to transmission line and detect.Comprise following processing procedure:
1. the attendant sends the order that detects sequence by the webmaster platform to concentrated optical transceiver 2, sends instruction to light mouth direction loopback to far-end optical transceiver 1, and detects this and detect sequence on concentrated optical transceiver 2, just can realize the diagnosis to the E part of path.The instruction that webmaster platform 91 sends can pass to far-end optical transceiver 1 and concentrated optical transceiver 2 by the overhead byte of optical link.
2. the attendant sends the order that detects sequence by the webmaster platform to concentrated optical transceiver 2, send (can utilize special network management path) instruction to optical transceiver 3 to E1 line direction loopback, and on optical transceiver 2, detect this and detect sequence, realize diagnosis to the F part of path.
3. attendant's order of sending cycle tests to optical transceiver 3 by the webmaster platform, send instruction to optical transceiver 4 to the light mouth direction loopback overhead byte transmission of optical link (can by), and on optical transceiver 3, detect this and detect sequence, realize diagnosis to the G part of path.
By above 3 steps, just can finish diagnosis to transmission line.In the whole diagnostic procedure, the Maintenance free personnel determine that to the on-the-spot code error tester that connects faulty section is convenient, fast and reliable.
To the test of subscribers feeder highway section M, N, then need the support (with reference to the mentality of designing of the utility model) of ustomer premises access equipment A, B to branch road test selector unit, optical transceiver 1,4 can provide to the E1 loopback at the line side or to the E1 line side and send out the detection sequence.
The utility model is embedded in the Error detection function in the optical transceiver, and design the branch road test selector unit of applying flexible, control the optical transceiver of circuit one side to be measured by webmaster in real time on demand and send out this detection sequence that detects sequence and receive loopback, optical transceiver (or subscriber equipment with the control circuit opposite side, but have the code error tester function) to light mouth direction (or to E1 line direction) loopback, just can realize existing three kinds of end-to-end test modes, equipment cost and operation expense but are lower than existing three kinds of end-to-end test modes, and fault location is rapid.When needs carried out that the whole network detects or circuit breaks down, the operation maintenance personnel only needed carry out shirtsleeve operation on the webmaster platform, carry out line test automatically by the optical transceiver of corresponding embedded error code testing function, and test result is reported to the webmaster platform.
Claims (6)
1. the optical transceiver of an embedded code error test function, comprise the optical transceiver part of forming by microprocessor unit, E1 line interface unit and optical line interface unit, the E1 line interface unit is connected with subscriber equipment by E1 service signal I/O end, the optical line interface unit is connected with optical fiber by light signal I/O end, the optical line interface unit comprises multiplexer and demodulation multiplexer, it is characterized in that:
Also comprise error code testing unit and branch road test selector unit; The error code testing unit comprises pseudo-random sequence generator and pseudo random sequence detector;
Microprocessor unit is connected E1 line interface unit, error code testing unit, branch road test selector unit and optical line interface unit by data/address bus with control bus, branch road test selector unit connects error code testing unit, E1 line interface unit and optical line interface unit respectively;
The detection sequence that pseudo-random sequence generator produces sends described branch road tester selected cell to, and branch road tester selected cell will send the pseudo random sequence detector cell to from the detection sequence of circuit to be measured; Described branch road test selector unit is under the control of microprocessor unit, finish the branch road of detection sequence between E1 line interface unit and optical line interface unit of E1 service signal or transmission and select and the direction selection, and branch road selection and the direction selection of detection sequence between E1 line interface unit and optical line interface unit from circuit to be measured of finishing E1 service signal or reception; Described E1 line interface unit is finished and is detected loopback and the encoding and decoding of E1 service signal, the Clock Extraction of E1 service signal and the selection of E1 service signal HDB3 sign indicating number and NRZ sign indicating number of sequence on circuit to be measured under the control of microprocessor unit.
2. the optical transceiver of a kind of embedded code error test function according to claim 1 is characterized in that: described E1 line interface unit comprises that the one 2 selects 1 switch, the 22 to select 1 switch, the 32 to select 1 switch, the 42 to select the clock extracting circuit and the HDB3 decoder of 1 switch, HDB3 encoder, E1 service signal; The one 2 to select one tunnel input of 1 switch be described E1 service signal input, and the one 2 to select another road input of 1 switch be described E1 service signal output and connect the 22 output that selects 1 switch; The 22 selects one road input of 1 switch to connect HDB3 encoder output, and the 22 selects another road input of 1 switch to connect HDB3 encoder input and connect the 42 selects 1 output switching terminal; The 32 selects the output of one road input connection HDB3 decoder of 1 switch, the 32 selects another road input of 1 switch to connect the one 2 clock extracting circuit input that selects the output of 1 switch and connect the E1 service signal, and the clock extracting circuit output of E1 service signal connects the input of HDB3 decoder; The 42 selects one road input of 1 switch to connect the 32 selects the output of 1 switch, and connects the input of described branch road tester selected cell, and the 42 selects another road input of 1 switch to connect the output of described branch road tester selected cell; The described the 1 selects the line loopback of the control end connection microprocessor unit of 1 switch to select control signal output ends, the described the 22 selects the control end of 1 switch to connect the output code type selection control signal output ends that microprocessor unit is exported, the described the 32 selects the control end of 1 switch to connect the input code type selection control signal output ends that microprocessor unit is exported, and the described the 42 selects the equipment loopback of the control end connection microprocessor unit output of 1 switch to select control signal output ends.
3. the optical transceiver of a kind of embedded code error test function according to claim 1 is characterized in that: described branch road tester selected cell comprises that the 52 selects 1 switch, the 62 to select 1 switch and the 72 to select 1 switch; Five, the 72 select one road input of 1 switch to connect the demodulation multiplexer output of optical line interface unit; The 52 selects another road input and the 62 of 1 switch to select one road input of 1 switch to be connected the output of E1 line interface unit, the 52 selects the pseudo random sequence detector of the output connection error code testing unit of 1 switch, six, the 72 select another road input of 1 switch to connect the pseudo-random sequence generator of error code testing unit, the 62 selects the multiplexer input of the output connection optical line interface unit of 1 switch, and the 72 selects the input of the output connection E1 line interface unit of 1 switch; The 52 selects the control end of 1 switch to connect the control signal output ends in the selection Error detection source of microprocessor unit, the 62 selects the control end of 1 switch to connect the control signal output ends of the selection of microprocessor unit to optical link transmission detection sequence, and the 72 selects the selection of the control end connection microprocessor unit of 1 switch to send the control signal output ends that detects sequence to the E1 circuit.
4. the optical transceiver of a kind of embedded code error test function according to claim 1 is characterized in that: described pseudo random sequence detector comprises pseudo random sequence synchronized signal detector, pseudo-random sequence generator, comparator and Bit Error Code Statistics unit; The pseudo random sequence detector receives described detection sequence from circuit to be measured, start pseudo-random sequence generator with detection sequence back output synchronously synchronizing signal, comparator compares from the detection sequence of circuit to be measured and the detection sequence step-by-step of pseudo-random sequence generator output the output of pseudo random sequence detector, and comparative result send the Bit Error Code Statistics unit to carry out Bit Error Code Statistics.
5. the optical transceiver of a kind of embedded code error test function according to claim 1, it is characterized in that: the described optical transceiver part of being made up of microprocessor unit, E1 line interface unit and optical line interface unit is arranged in the same integral device with described error code testing unit, branch road test selector unit.
6. the optical transceiver of a kind of embedded code error test function according to claim 1 is characterized in that: described error code testing unit and branch road test selector cell design are in same integrated circuit (IC) chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2004200072251U CN2684471Y (en) | 2004-03-15 | 2004-03-15 | Optical transmitter and receiver with embedded error code testing function |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2004200072251U CN2684471Y (en) | 2004-03-15 | 2004-03-15 | Optical transmitter and receiver with embedded error code testing function |
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| CN2684471Y true CN2684471Y (en) | 2005-03-09 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100409624C (en) * | 2005-04-14 | 2008-08-06 | 武汉电信器件有限公司 | 155 M bit error code analysis tester based on field programmable gate array |
| CN101183911B (en) * | 2007-12-12 | 2011-05-11 | 中兴通讯股份有限公司 | Device and method for implementing SDH veneer error code test |
| CN101457253B (en) * | 2008-12-12 | 2011-08-31 | 深圳华大基因研究院 | Sequencing sequence error correction method, system and device |
| CN103326776A (en) * | 2012-03-23 | 2013-09-25 | 中兴通讯股份有限公司 | Measuring method for detecting optical network failure and device |
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- 2004-03-15 CN CNU2004200072251U patent/CN2684471Y/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100409624C (en) * | 2005-04-14 | 2008-08-06 | 武汉电信器件有限公司 | 155 M bit error code analysis tester based on field programmable gate array |
| CN101183911B (en) * | 2007-12-12 | 2011-05-11 | 中兴通讯股份有限公司 | Device and method for implementing SDH veneer error code test |
| CN101457253B (en) * | 2008-12-12 | 2011-08-31 | 深圳华大基因研究院 | Sequencing sequence error correction method, system and device |
| CN103326776A (en) * | 2012-03-23 | 2013-09-25 | 中兴通讯股份有限公司 | Measuring method for detecting optical network failure and device |
| CN103326776B (en) * | 2012-03-23 | 2016-12-14 | 南京中兴软件有限责任公司 | A kind of measuring method detecting optical network fault and device |
| CN104301035B (en) * | 2014-10-17 | 2017-03-29 | 深圳市易飞扬通信技术有限公司 | For testing the detection means of SFP |
| CN104793069A (en) * | 2015-03-11 | 2015-07-22 | 四川华拓光通信股份有限公司 | Data transmission performance self-checking system of active cable |
| CN104793069B (en) * | 2015-03-11 | 2018-03-06 | 四川华拓光通信股份有限公司 | A kind of data transmission performance self-checking system of active type cable |
| CN107819638A (en) * | 2016-09-14 | 2018-03-20 | 中国电信股份有限公司 | Error-code testing method and system and transmission comprehensive network management |
| CN107819638B (en) * | 2016-09-14 | 2020-02-07 | 中国电信股份有限公司 | Error code testing method and system and transmission integrated network management |
| CN107135033A (en) * | 2017-05-27 | 2017-09-05 | 烽火通信科技股份有限公司 | A kind of optical link fault diagnosis system and method based on PRBS |
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